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The Structure of Intelligence in Relation
Theory of Intelligence
Lloyd G Humphreys
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ability achievement American analysis average basis behavior biological boys called changes child chromosomes cognitive common compared concept contribution correlation culture defined determined distribution effects environment environmental equal evidence example exist expected experience fact factors families females Figure findings function genes genetic genotype girls given goal greater heredity heritability higher human important increase indicate individual influence intellectual intelligence tests interaction kinds learning less limited males mean measures mental method nature Negro object observed parents patterns percent performance personality phenotype population possible practice present probably problem programs psychological question race ratio reason refer relatively reported responses retarded sample scores selection sex difference skills social standard statistical status structure suggested Table theory trait twins University variables variance variation various York